A024610 - OEIS

A024610

Position of n^2 in A003136.

1, 2, 4, 6, 9, 12, 16, 21, 26, 32, 37, 44, 50, 57, 66, 74, 83, 91, 101, 111, 123, 134, 145, 157, 168, 182, 195, 209, 223, 237, 252, 266, 283, 300, 317, 332, 349, 367, 384, 403, 424, 444, 464, 484, 504, 526, 547, 570, 592, 614, 637, 660, 685, 711, 733, 758, 784

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Peter Kagey, Table of n, a(n) for n = 0..10000

PROG

(Python)

from sympy import factorint

def A024610(n): return n**2+1-sum(1 for m in range(n**2+1) if any(e&1 for p, e in factorint(m).items() if p%3==2)) # Chai Wah Wu, Nov 15 2025

CROSSREFS

Cf. A000290 (n^2), A003136.

Sequence in context: A351719 A292459 A194250 * A022778 A156022 A224809